H.R. 3314, “to provide for the participation of the United States in the International Monetary Fund and the International Bank for Reconstruction and Development,” better known as the Bretton Woods Agreements Act, passed the 79th House on June 7, 1945, by a vote of 345-18, and the Senate on July 19, by a vote of 61-16, and was signed into law by Harry Truman on July 31, becoming Public Law 171, cited at 59 Stat. 512.
Opposition was slim, and mainly Republican; there were no Democratic “nay” votes in the House and only two in the Senate (Burton K. Wheeler of Montana and Pappy O’Daniel of Texas). And most of it came from the central region of the country.
Here are the states having at least one Senator voting “nay.”
And here are the states having at least one Congressman voting “nay.”
This probably confirms what one might have thought about the geographic basis for (what we’re not supposed to call) isolationism—that it was largely a Republican phenomenon of the West Central region of the country.